\documentstyle[12pt]{article}      % LaTeX2.09
 \textheight15cm \textwidth8cm \parindent0mm \parskip 1ex plus2ex minus0.8ex
\begin{document}
\newfont{\sss}{cmmi10}
3 symbols used by musicians: {\sss\symbol{91} \symbol{92} \symbol{93}}

\newfont{\ttitalicsmall}{cmitt10}
\newfont{\ttitaliclarge}{cmitt10 scaled\magstep2}
The same text in 3 different fonts/font sizes!\par
{\ttitalicsmall The same text in 3 different fonts/font sizes!\par}
{\ttitaliclarge The same text in 3 different fonts/font sizes!\par}
\end{document}
